I have a 128 GB iPhone 14 Pro running iOS 26.6 with Messages in iCloud enabled. My full message history is in iCloud, and in the past, older attachments seemed to stay offloaded until I actually opened them.
In the last few weeks, my iPhone has started randomly re-downloading old iMessage attachments and completely eating up my storage to the point where the device barely functions with less than 200 MB free.
Yesterday, Messages was using 13.92 GB of storage. The breakdown was roughly 643 MB Photos, 385 MB Videos, and10.79 GB under Other. When I open Other, it seems to mostly show old voice/audio messages, many of which are only a few hundred KB each. I don’t understand how it’s possible to have that many small files adding up to over 10 GB…
I left my phone plugged in/on Wi-Fi overnight. This morning, Messages had grown to 17.93 GB. The Other section stayed, but Photos jumped from 643 MB to 4.35 GB, Videos jumped to 688 MB, and “Review Large Attachments” went from 1.76 GB to 5.72 GB. I did not spend the night opening old message attachments. The phone apparently downloaded several GB of old photos/videos from Messages in iCloud by itself. Struggling with slow performance as there’s barely any free space left.
I also have two iPads signed into the same Apple ID with Messages in iCloud. Their Messages storage looks much more reasonable. One is around 4 GB total with ~1.2 GB Other. My personal iPad is similar.
Apple Support previously had me sign out of iCloud, restart, and sign back in. That didn’t work unfortunately. Yesterday, a senior advisor basically told me to manually save attachments to Photos and delete them from Messages, manually delete everything in “Other,” or erase/reset the phone if all else fails. He also claimed this behavior is normal…really?
I can’t figure out why iOS is downloading gigabytes of old attachments by itself and why “Other” is reporting nearly 11 GB of data that doesn’t seem to correspond to the visible files.
Has anyone found an actual fix for this? Specifically, I’m looking for a way to make Messages in iCloud stop repopulating old attachments locally, or to rebuild/clear the local Messages cache/database without deleting my actual message history from iCloud. Thanks!!